Data Validation in DevExpress Data Editors for .NET MAUI
- 2 minutes to read
Data editors allow users to input different types of information: phone numbers, zip codes, email addresses, and so on. You can validate user input before it is committed to the underlying data object at your View Model level.
The following example validates editor input values when a user taps the Submit button on the page:
void OnSubmitClicked(Object sender, EventArgs e) {
if (viewModel.Validate())
DisplayAlert("Success", "Your account has been created successfully", "OK");
}
public bool Validate() {
EmailHasError = string.IsNullOrEmpty(Email);
LoginHasError = string.IsNullOrEmpty(Login);
PasswordHasError = !CheckPassword();
BirthDateHasError = BirthDate == null;
PhoneHasError = Phone == null || Phone.Length != 10;
NotesHasError = Notes.Length > 100;
return !(NotesHasError || PhoneHasError || EmailHasError || LoginHasError || PasswordHasError);
}
Set an editor’s HasError property to true
to indicate that the editor value contains an error. You can define alert hint text that notifies a user about errors. To do this, specify the EditBase.ErrorText property:
<dx:TextEdit
BoxMode="{Binding SelectedBoxMode}"
StartIcon="face_black_24dp"
Text="{Binding Login, Mode=TwoWay}"
HasError="{Binding LoginHasError}"
LabelText="Login"
HelpText="*Required"
ErrorText="Login is required"
PlaceholderText="Enter login"/>
You can also use the DataFormView component to review and edit a business object’s properties. The component allows you to automatically create editors based on business object property types.
Note
As an alternative to standalone editors, you can use the Data
You can also use Text